Been looking at upgrading memory card in the Switch, cheapest good quality one on Amazon seems to be the https://www.amazon.co.uk/Samsung-Mobile-UK-MicroSD-Adapter/dp/B06XFS5657/ref=sr_1_2?s=computers&ie=UTF8&qid=1532750859&sr=1-2&keywords=400gb%2Bmicro%2Bsd&th=1
256gb for £75 or around €84 not sure of other places than Amazon really to get good quality micro SD cards, any tips appreciated.
This damn summer sale and a few games like Doom/Resi evil have knocked the shit outta my 128gb card, don't like having to remove good games for other... good games.
I've been looking for a 256 GB micro SD card myself. Here in Central Europe aren't any shops that go below Amazon.de's €80-85 for a Samsung card. I don't really look at anything that is not from Samsung or SanDisk because those are the two most trustworthy manufacturers of SD cards. So yeah, right now ~€80 is the lowest you are going to pay for a 256 GB card. I find it doubtful that higher capacity cards can notably push down the prices of the currently available sizes this year, so if you need a new card now or soon, you'll have to bite the bullet.
Update for my game collection:
Crash Bandicoot N.Sane Trilogy (P)
Ys VIII: Lacrimosa of Dana (P)
Sonic Mania Plus (P)
Octopath Traveler (P)
Hollow Knight (D)